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Old 02-12-2012, 08:18 PM   #1
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Help needed answering gas question

I have a 1997 jeep wrangler sahara 4.0 automatic inline 6. And it doesn't get good gas mileage at all and I was wondering if there was anything I could do to improve the gas mileage?

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Old 02-12-2012, 08:21 PM   #2
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1) What mpg you getting?
2) What size tire?
3) What gears?
4) How are you meseureing your mileage?

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Old 02-12-2012, 08:22 PM   #3
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Not a whole lot you can do unless something serious is wrong. I get about 14.8 to 15.9 mpg during the winter. I HATE winter blend gas. During summer I get 16.0 to 17.4

Check your tire pressure, air filter, when was the last time you had a tube up? How many miles are you going on with your spark plugs?

What kind of setup do you have now? Stock, lift, what size tires?
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Old 02-12-2012, 08:28 PM   #4
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You can sell it and buy an Eco p.o.s
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Old 02-12-2012, 08:31 PM   #5
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Why ask the gas question and no details.
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Old 02-12-2012, 08:41 PM   #6
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A tune up, cleaning the IAC & throttle body, and properly inflating the tires can really help. I personally have observed about a 1MPG increase since I replaced my starter and serpentine belt but I suspect that's related to the easier starts thanks to the new starter. But anything above 16mpg with the I6 is a pipe dream in all probability especially considering the age of your Jeep. I count myself lucky to average about 15 to 15.5 in mixed driving on my 99 I6 with 94k and in need of a tune up.
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Old 02-12-2012, 08:50 PM   #7
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How fast is he accelerating & driving? The right foot is the biggest variable IMO.
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Old 02-12-2012, 08:54 PM   #8
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I am a very slow driver. It takes me about 15 seconds to get to 35mph
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Old 02-12-2012, 08:58 PM   #9
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Quote:
Originally Posted by lgsahara1997 View Post
I am a very slow driver. It takes me about 15 seconds to get to 35mph
How could you not answer/ignore the questions asked above and expect a real answer?

Tire size...
Axle ratio...
How are you measuring your mpg....
What mpg do you think you're getting?
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Old 02-12-2012, 09:09 PM   #10
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I wasn't ignoring it. I was trying to figure out the answer to those questions because I just bought it a week ago and I don't know the answer to some of those questions
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Old 02-12-2012, 09:14 PM   #11
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So you don't know your mpg yet but you are unhappy with it? Come back next week when you have more data.
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Old 02-12-2012, 09:20 PM   #12
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I know that I'm getting around 11 mpg? I'm just trying to ask a question so there's no need to be rude
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Old 02-12-2012, 09:23 PM   #13
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Quote:
Originally Posted by lgsahara1997
I wasn't ignoring it. I was trying to figure out the answer to those questions because I just bought it a week ago and I don't know the answer to some of those questions
I take it that most likely the fuel gage is going to the left far faster than you think it should. Being that it looks like your from Florida I wouldn't imagine winter mix would be that much of a deal for you considering it's based off regions. First thing you should do is check your tire pressure and air filter.

When you fill up, how much gas are you actually putting in? When my low fuel light comes on I still have at least 4.5 gallons. The fuel gauges are pretty infamous for erring on the side of conservative caution.

I was looking at your profile pic. But it's too small to tell in my phone but it definitely looks like you are running 32s+ perhaps?

From full to 1/2 how many miles are you getting? If its at least 120 or so, you're doing good and wouldn't expect much more. These jeeps use the gas That a Prius saves.
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Old 02-12-2012, 09:25 PM   #14
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Everyone play nice... 11mpg is low.. I would check to into making sure your speedo gear is the correct one for your tire size or check your speed via GPS to make sure the speedo is correct.
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Old 02-12-2012, 09:26 PM   #15
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It has 33inch tires and I usually fill up but I just filled it up and reset my trip on my odometer so when It gets down to a half of tank I will know
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Old 02-12-2012, 09:27 PM   #16
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Ok Thanks
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Old 02-12-2012, 09:29 PM   #17
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I'm wiling to bet that you are still on factory gears of 3.07 or 3.73 with those 33s. If so, there's part of your problem. Big ole tires with factory gears. Next time you are out on the highway check your RPMs in 5th gear and let us know what it is.

By 5th gear I mean check where , say 65 or 70 , places you on your tach
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Old 02-12-2012, 09:30 PM   #18
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Ok thanks! Would there be a big difference if I changed the gears?
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Old 02-12-2012, 09:36 PM   #19
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mileage

wow i feel lucky. im gettin an honest 17 -18 mpg with a 4.0 and a stick in a 2004. but 4jeepn could be right. your speedo could be off and your really goin further than it says. just a thought
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Old 02-12-2012, 09:37 PM   #20
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Yes. Also as stated before. Make sure your speed is correct. That mak be throwing you off as well.

As far as what gears, if that is prt of the problem, to go to is a whole other thread and there are plenty of them on the forum to search for.

I am about to find my self in the same position as far as what gears to go to when I make it to 33s. Good luck. Get some information and come back to us.
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Old 02-12-2012, 09:38 PM   #21
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One other thing to consider, if the speedo is off due to tire size so is the odometer. Take a cruise down the interstate when ya pass one mile marker hit the trip and check it the next mile marker. So the mileage you are dividing by how many gallons you burn is off so your 11mpg calculated would be off too.
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Old 02-12-2012, 09:40 PM   #22
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My speedometer reads 3mph too slow
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Old 02-12-2012, 10:00 PM   #23
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LOL I just filled up and check my MPG and I got about 12.5. I expect that with a brick on wheels.
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Old 02-12-2012, 10:16 PM   #24
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Quote:
Originally Posted by lgsahara1997 View Post
My speedometer reads 3mph too slow
Depends on how fast you're going. It will read a certain percentage off. Mine has 31's and 3.07 gears and is 10 percent off, which makes it really easy to compensate for.

40mph = 44mph actual
55mph = 55mph actual

At 20 mph, it's only off 2 mph. At 60, it's off 6.

Once you figure out how far yours is of, percentage wise, you can compensate for the difference when you figure your mileage.

Mine gets 14-15 average, btw.
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Old 02-13-2012, 07:06 AM   #25
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Ok there must be something wrong because my jeep went down a quarter of a tank and I set the trip when I filled it up and it only went 12 miles in a quarter of a tank
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Old 02-13-2012, 08:31 AM   #26
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Have you checked for a leak or do you smell gas? Second option would be drive till the gas light turns on and see how much fuel you put in then. Your gauge could just be really off. Its been known to happen.
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Old 02-13-2012, 08:47 AM   #27
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I'm running a 4.7L/AX-15, 37's with 4.56 gears I'm getting 14mpg. I would suggest new gears to get you back to stock power.
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Old 02-13-2012, 09:23 AM   #28
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Originally Posted by lgsahara1997 View Post
It has 33inch tires and I usually fill up but I just filled it up and reset my trip on my odometer so when It gets down to a half of tank I will know
Your fuel gauge has nothing to do with how the mpg is correctly calculated. You can't look at the gauge to know how many gallons have been consumed or remain in the tank, it isn't accurate enough for that. In fact, the Wrangler's gas gauge is notoriously inaccurate.

The way to accurately calculate your mpg is as follows:

1) Fill your gas tank completely.
2) Reset your Trip Odometer so it indicates 0 miles.
3) Drive until the tank is nearly empty. The further you drive on this tank of gas, the more accurate your mpg calculation will be.
4) Fill up the gas tank completely and write down the exact number of gallons it requires to refill the tank.
5) Divide the number of miles indicated in your Trip Odometer, which is how many miles you have driven since you last filled it up, by the exact number of gallons it took to refill your gas tank.
6)The result of dividing the number of miles driven since your last fill up by the number of gallons between the fillups consumed is your MPG.
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Old 02-13-2012, 10:00 AM   #29
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The gauge may have nothing to do with "accurately " giving your mileage but it can help to get an estimate.
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Old 02-13-2012, 10:35 AM   #30
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Your fuel gauge has nothing to do with how the mpg is correctly calculated. You can't look at the gauge to know how many gallons have been consumed or remain in the tank, it isn't accurate enough for that. In fact, the Wrangler's gas gauge is notoriously inaccurate.

The way to accurately calculate your mpg is as follows:

1) Fill your gas tank completely.
2) Reset your Trip Odometer so it indicates 0 miles.
3) Drive until the tank is nearly empty. The further you drive on this tank of gas, the more accurate your mpg calculation will be.
4) Fill up the gas tank completely and write down the exact number of gallons it requires to refill the tank.
5) Divide the number of miles indicated in your Trip Odometer, which is how many miles you have driven since you last filled it up, by the exact number of gallons it took to refill your gas tank.
6)The result of dividing the number of miles driven since your last fill up by the number of gallons between the fillups consumed is your MPG.
Thanks Jerry. I was just going to say the same thing. Don't fathers teach their children anything any more......

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